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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
पर्याय
oxygen
hydrogen
nitrogen
water-vapour
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उत्तर
hydrogen
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संबंधित प्रश्न
Write true or false for the statement
A natural change can also be a desirable change
Chemical changes are accompanied by changes in energy.
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Fill in the blank
Changes that occur in nature are called ______
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
State whether the following statement is true or false. If false write the correct statement.
Melting of butter and wax are examples of chemical changes.
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
Distinguish physical and chemical changes.
Natural changes which take place in nature on their own, are beyond the control of human being.
Mention some of the different conditions needed for chemical changes to occur.
